[llvm] [AMDGPU] Restore non-buffer atomic tests lost in #93801 (PR #94978)

[Matt Arsenault via llvm-commits]

================
@@ -0,0 +1,56 @@
+; RUN: llc < %s -mtriple=amdgcn -mcpu=gfx90a -verify-machineinstrs | FileCheck %s -check-prefix=GFX90A
+
----------------
arsenm wrote:

Same, add global back to file name 

https://github.com/llvm/llvm-project/pull/94978